About the Authors
Michael Smith Laboratories, University of British Columbia, Vancouver, Canada
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Stn. Sainte-Foy, Canada
National Institute of Biological Sciences, Beijing, China
Department of Botany, University of British Columbia, Vancouver, Canada
The authors have declared that no competing interests exist.
Conceived and designed the experiments: HG NQ YZ XL. Performed the experiments: HG NQ YTC EKL YH OXD PG SH PD YL. Analyzed the data: HG NQ YTC EKL YH OXD PG SH PD YL FS YZ XL. Contributed reagents/materials/analysis tools: FS YZ XL. Wrote the paper: HG YZ XL.